It's Common with PC Audio

A polarity inversion capability is common is PC audio, typically a feature of player software. Two of the players that I use have this capability: foobar2000 and cPlay. Unlike when this function is done at line level in a preamp, there are no extra gain stages and no audible effect on sound quality that I have been able to detect, other than inverting polarity. On my system this makes some recordings sound better and others worse, and on some it doesn't seem to make much difference.

Tony Lauck

"Perception, inference and authority are the valid sources of knowledge" - P.R. Sarkar

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